Alloys



Patented Feb. 7, 1939 PATENT OFFICE ALLOYS John Johnson, Toronto, Ontario, Canada No Drawing. Application June 6, 1938, Serial No. 212,135

4 Claims.

This invention relates to alloys such as described in my prior United States Patent No. 2,014,083 dated Sept 10, 1935, and comprising silver, copper, cadmium and zinc substantially in the proportion of Per cent Silver 33 Copper 30 Cadmi m 35- Zinc 2 This alloy gives excellent results but the amount of silver employed makes the alloy rather expensive. Further, this alloy is not as successful as might be desired in brazing stainless steel to stainless steel or other metals.

My object therefore is to provide an alloy containing a smaller proportion of silver than heretofore used without materially affecting the desirable characteristics of the alloy and increasing its adaptability to the brazing of stainless steel.

I attain my object by decreasing the proportion of silver in the alloy and also the proportion of cadmium, at the same time increasing the proportion of copper and to a small extent the proportion of zinc.

In practice I have used silver, copper, cadmium and zinc within the following range of proportions:

' Per cent Silver 7 to 25 Copper 62 to 40 Ca m 19 to 31 Zinc 9 /210 3 Specific examples of alloys according to my invention which I have tried are as follows:

Although all the examples disclosed give good results, No. 5 seems to give the best results as the proportion of silver is low enough for economy, great enough for brazing metals generally but not great enough to spoil it for use in brazing stainless steel.

This alloy does not require the use of expensive fiuxes but works well with ordinary borax.

While the melting point varies according to the specific example employed, it will in general be lower than that of most alloys in general use.

This alloy is well adapted for brazing bronze, brass, copper, silver and gold, nickel, nickelsilver, monel metal and steel; is strong, tough, easily worked, and much cheaper than alloys which use large proportions of precious metals.

What I claim as my invention is:

1. An alloy which consists of silver varying from about 7 to about 25%; copper varying from about 62% to about cadmium varying from about 19% to 31%; and zinc varying from about 9 /2% to 3%.

2. An alloy which consists of about 25% silver, about 40% copper, about 31% cadmium and about 4% zinc.

3. An alloy which consists of about 10 silver, about 5'7 /2% copper, about 22% cadmium and about 10% zinc.

4. An alloy which consists of about 7%% silver, about 62% copper, about 21% cadmium and about 9 /g% zinc.

JOHN JOHNSON.

Cad- Melting 40 Example Silver Copper mium Zmc point Percent Percent Percent Percent F. No. L 25 40 31 4 1076 18 48 31 3 1094 15% 48 31 536 1076 12 58 21 9 1149 10% 57% 22 10 1124 9% 60 19 11% 1150 7% 62 21 9M 1150 

